Bangla Academy Dictionary:

Definition: 1

an act or instance of oscillating.

Definition: 2

a single swing or movement in one direction of an oscillating body.

Definition: 3

fluctuation between beliefs, opinions, conditions, etc.

Definition: 4

Physics. an effect expressible as a quantity that repeatedly and regularly fluctuates above and below some mean value, as the pressure of a sound wave or the voltage of an alternating current. a single fluctuation between maximum and minimum values in such an effect.

Definition: 5

Mathematics. the difference between the least upper bound and the greatest lower bound of the functional values of a function in a given interval. Also called saltus. the limit of the oscillation in an interval containing a given point, as the length of the interval approaches zero.